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Home›Repair guides›Cummins/Onan›Charge Air Cooler Heat Exchanger Cleaning

Cummins/Onan CFP5E / CFP7E — Charge Air Cooler Heat Exchanger Cleaning

Maintenance

For the Cummins/Onan CFP5E / CFP7E, from the Cummins/Onan owner's manual.

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Before you start

  • Do not use caustic cleaners.

Procedure

  1. Place AUTO/MANUAL Mode Switch in MANUAL position.
  2. Disconnect both batteries, negative cable first.
  3. Shut off manual raw water and bypass water valves.
  4. Drain coolant system.
  5. Disconnect air tubing and raw water fittings from heat exchangers.
  6. Remove heat exchangers.
  7. Flush internally with cleaning solution opposite normal air-flow.
  8. Wash with hot soapy water, rinse, blow compressed air until dry.

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Source: Cummins/Onan owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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